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Narrowband blue emitter based on fused nitrogen/carbonyl combination with external quantum efficiency approaching 30%

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Abstract

Multi-resonance thermally activated delayed fluorescence (MR-TADF) emitters can enable narrowband emission with high color purity and electroluminescence efficiency. Nitrogen/carbonyl (N/C=O) system is receiving increasing attention while the nitrogen/ boron (N/B) system has been widely studied. Donor decoration is an effective approach for N/B type MR-TADF system but always leads to broadening and red-shifting of the emission band in N/C=O MR-TADF system. We attribute these unfavorable phenomena to the formation of intramolecular charge transfer between the MR-core and peripheral donors. To address this issue, we have developed a new strategy by decorating DMQAO (a fused N/C=O MR-core) with a triazine acceptor and a neutral terphenyl group to construct MTDMQAO and MBDMQAO, respectively. The introduction of the triazine acceptor not only realizes efficient narrowband emission in MTDMQAO, but also accelerates the reverse intersystem crossing process through enhanced spin-orbital coupling. As a result, MTDMQAO exhibits a significantly higher external quantum efficiency of 29.4% compared to the referent emitters, validating the rationality of our derivation strategy. This study highlights the potential of the N/C=O system for MR-TADF emitters and provides important insights for understanding the difference between N/B and N/C=O systems.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51873139, 22175124, 62175171, 61961160731), the Natural Science Foundation of Jiangsu Province of China (BK20220057), and the Suzhou Science and Technology Plan Project (SYG202010). This work was also supported by the Suzhou Key Laboratory of Functional Nano & Soft Materials, the Collaborative Innovation Center of Suzhou Nano Science & Technology, the 111 Project, and the Joint International Research Laboratory of Carbon-Based Functional Materials and Devices.

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou, 215123, China

    Long Chen, Jia-Heng Cai, You-Jun Yu, Yang-Kun Qu, Sheng-Yi Yang, Sheng-Nan Zou, Rui-Hong Liu, Dong-Ying Zhou, Liang-Sheng Liao & Zuo-Quan Jiang

  2. Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Macao, 999078, China

    Liang-Sheng Liao

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  1. Long Chen
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Supporting information The supporting information is available online at https://chem.scichina.com and https://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Chen, L., Cai, JH., Yu, YJ. et al. Narrowband blue emitter based on fused nitrogen/carbonyl combination with external quantum efficiency approaching 30%. Sci. China Chem. 67, 351–359 (2024). https://doi.org/10.1007/s11426-023-1669-9

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